Re: Add instance IsString ShowS where fromString = showString

On Sun, Sep 27, 2009 at 10:51:04PM +0200, Bas van Dijk wrote:

It would be really nice to use OverloadedStrings when constructing a ShowS, for example in a definition of showsPrec in an instance for Show.

The patch attached in the ticket[3544] adds the necessary instance to base/GHC/Show.lhs:

instance IsString ShowS where fromString = showString

Note that this does require TypeSynonymInstances.

and also FlexibleInstances. I think that's a problem, as Ganesh outlined.